<!DOCTYPE html>
<html lang='en'>

<head>
   <meta charset='UTF-8'>
   <meta http-equiv='X-UA-Compatible' content='IE=edge'>
   <meta name='viewport' content='width=device-width, initial-scale=1.0'>
   <title>Document</title>
   <script src='../vue.js'></script>
</head>

<body>
   <div id='app'>
      <h1>计数器{{count}}</h1>
      <button v-on:click="count = count+1">累加</button>
      <button v-on:click="add">累加</button>
   </div>

   <script>
      Vue.config.productionTip = false;

      const vm = new Vue({
      el: '#app',
         data() {
            return {
               count: 0
            }
         },
         methods: {
            add() {
               this.count = this.count + 1
            }

         }
      })
   </script>
</body>

</html>